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A ray of light incident normally on an i...

A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be

A

`sqrt(2)`

B

`sqrt(3)`

C

1.5

D

2

Text Solution

Verified by Experts

The correct Answer is:
A
`45^(@) gt i_(c ) `
`rArr sin 45^(@) gt sin i_(c ) rArr (1)/(sqrt(2)) gt (1)/(n) rArr n gt sqrt(2)`
`n_("least") = sqrt(2).`
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